<?php


namespace Zxing\Common;

use Zxing\Common\AbstractEnum;

/**
 * Encapsulates a Character Set ECI, according to "Extended Channel
 * Interpretations" 5.3.1.1 of ISO 18004.
 */
final class CharacterSetECI
{
    /**#@+
     * Character set constants.
     */
    const CP437 = 0;
    const ISO8859_1 = 1;
    const ISO8859_2 = 4;
    const ISO8859_3 = 5;
    const ISO8859_4 = 6;
    const ISO8859_5 = 7;
    const ISO8859_6 = 8;
    const ISO8859_7 = 9;
    const ISO8859_8 = 10;
    const ISO8859_9 = 11;
    const ISO8859_10 = 12;
    const ISO8859_11 = 13;
    const ISO8859_12 = 14;
    const ISO8859_13 = 15;
    const ISO8859_14 = 16;
    const ISO8859_15 = 17;
    const ISO8859_16 = 18;
    const SJIS = 20;
    const CP1250 = 21;
    const CP1251 = 22;
    const CP1252 = 23;
    const CP1256 = 24;
    const UNICODE_BIG_UNMARKED = 25;
    const UTF8 = 26;
    const ASCII = 27;
    const BIG5 = 28;
    const GB18030 = 29;
    const EUC_KR = 30;
    /**
     * Map between character names and their ECI values.
     *
     * @var array
     */
    protected static $nameToEci = array(
        'ISO-8859-1' => self::ISO8859_1,
        'ISO-8859-2' => self::ISO8859_2,
        'ISO-8859-3' => self::ISO8859_3,
        'ISO-8859-4' => self::ISO8859_4,
        'ISO-8859-5' => self::ISO8859_5,
        'ISO-8859-6' => self::ISO8859_6,
        'ISO-8859-7' => self::ISO8859_7,
        'ISO-8859-8' => self::ISO8859_8,
        'ISO-8859-9' => self::ISO8859_9,
        'ISO-8859-10' => self::ISO8859_10,
        'ISO-8859-11' => self::ISO8859_11,
        'ISO-8859-12' => self::ISO8859_12,
        'ISO-8859-13' => self::ISO8859_13,
        'ISO-8859-14' => self::ISO8859_14,
        'ISO-8859-15' => self::ISO8859_15,
        'ISO-8859-16' => self::ISO8859_16,
        'SHIFT-JIS' => self::SJIS,
        'WINDOWS-1250' => self::CP1250,
        'WINDOWS-1251' => self::CP1251,
        'WINDOWS-1252' => self::CP1252,
        'WINDOWS-1256' => self::CP1256,
        'UTF-16BE' => self::UNICODE_BIG_UNMARKED,
        'UTF-8' => self::UTF8,
        'ASCII' => self::ASCII,
        'GBK' => self::GB18030,
        'EUC-KR' => self::EUC_KR,
    );
    /**#@-*/
    /**
     * Additional possible values for character sets.
     *
     * @var array
     */
    protected static $additionalValues = array(
        self::CP437 => 2,
        self::ASCII => 170,
    );
    private static $name = null;

    /**
     * Gets character set ECI by value.
     *
     * @param string $name
     * @return CharacterSetEci|null
     */
    public static function getCharacterSetECIByValue($value)
    {
        if ($value < 0 || $value >= 900) {
            throw new Exception\InvalidArgumentException('Value must be between 0 and 900');
        }
        if (false !== ($key = array_search($value, self::$additionalValues))) {
            $value = $key;
        }
        array_search($value, self::$nameToEci);
        try {
            self::setName($value);
            return new self($value);
        } catch (Exception\UnexpectedValueException $e) {
            return null;
        }
    }

    private static function setName($value)
    {
        foreach (self::$nameToEci as $name => $key) {
            if ($key == $value) {
                self::$name = $name;
                return true;
            }
        }
        if (self::$name == null) {
            foreach (self::$additionalValues as $name => $key) {
                if ($key == $value) {
                    self::$name = $name;
                    return true;
                }
            }
        }
    }

    /**
     * Gets character set ECI name.
     *
     * @return character set ECI name|null
     */
    public static function name()
    {
        return self::$name;
    }

    /**
     * Gets character set ECI by name.
     *
     * @param string $name
     * @return CharacterSetEci|null
     */
    public static function getCharacterSetECIByName($name)
    {
        $name = strtoupper($name);
        if (isset(self::$nameToEci[$name])) {
            return new self(self::$nameToEci[$name]);
        }
        return null;
    }
}